7. Hydrometallurgical processes
Whether it's concentrates from the mining and metallurgy industries or composite residues, hydrometallurgy of PGMs is virtually the only way to separate them. Dissolution takes place in an acidic oxidizing medium. Solution treatment with molten salts can also be effective and selective in certain cases.
Leaching is presented in the articles Solid-liquid extraction
7.1 Dissolution with aqua regia
This method is well suited to lead smelting residues containing 20-70% precious metals.
The reactions governing the solution of platinum are as follows:
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Hydrometallurgical processes
Platinoid separation processes
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